/*!
 * jQuery pagination plugin v1.4.1
 * http://esimakin.github.io/twbs-pagination/
 *
 * Copyright 2014-2016, Eugene Simakin
 * Released under Apache 2.0 license
 * http://apache.org/licenses/LICENSE-2.0.html
 */
(function($, window, document, undefined) {
  "use strict";

  var old = $.fn.twbsPagination;

  // PROTOTYPE AND CONSTRUCTOR

  var TwbsPagination = function(element, options) {
    this.$element = $(element);
    this.options = $.extend({}, $.fn.twbsPagination.defaults, options);

    if (
      this.options.startPage < 1 ||
      this.options.startPage > this.options.totalPages
    ) {
      throw new Error("Start page option is incorrect");
    }

    this.options.totalPages = parseInt(this.options.totalPages);
    if (isNaN(this.options.totalPages)) {
      throw new Error("Total pages option is not correct!");
    }

    this.options.visiblePages = parseInt(this.options.visiblePages);
    if (isNaN(this.options.visiblePages)) {
      throw new Error("Visible pages option is not correct!");
    }

    if (this.options.onPageClick instanceof Function) {
      this.$element.first().on("page", this.options.onPageClick);
    }

    // hide if only one page exists
    if (this.options.hideOnlyOnePage && this.options.totalPages == 1) {
      this.$element.trigger("page", 1);
      return this;
    }

    if (this.options.totalPages < this.options.visiblePages) {
      this.options.visiblePages = this.options.totalPages;
    }

    if (this.options.href) {
      this.options.startPage = this.getPageFromQueryString();
      if (!this.options.startPage) {
        this.options.startPage = 1;
      }
    }

    var tagName =
      typeof this.$element.prop === "function"
        ? this.$element.prop("tagName")
        : this.$element.attr("tagName");

    if (tagName === "UL") {
      this.$listContainer = this.$element;
    } else {
      this.$listContainer = $("<ul></ul>");
    }

    this.$listContainer.addClass(this.options.paginationClass);

    if (tagName !== "UL") {
      this.$element.append(this.$listContainer);
    }

    if (this.options.initiateStartPageClick) {
      this.show(this.options.startPage);
    } else {
      this.render(this.getPages(this.options.startPage));
      this.setupEvents();
    }

    return this;
  };

  TwbsPagination.prototype = {
    constructor: TwbsPagination,

    destroy: function() {
      this.$element.empty();
      this.$element.removeData("twbs-pagination");
      this.$element.off("page");

      return this;
    },

    show: function(page) {
      if (page < 1 || page > this.options.totalPages) {
        throw new Error("Page is incorrect.");
      }
      this.currentPage = page;

      this.render(this.getPages(page));
      this.setupEvents();

      this.$element.trigger("page", page);

      return this;
    },

    buildListItems: function(pages) {
      var listItems = [];

      if (this.options.first) {
        listItems.push(this.buildItem("first", 1));
      }

      if (this.options.prev) {
        var prev =
          pages.currentPage > 1
            ? pages.currentPage - 1
            : this.options.loop
            ? this.options.totalPages
            : 1;
        listItems.push(this.buildItem("prev", prev));
      }

      for (var i = 0; i < pages.numeric.length; i++) {
        listItems.push(this.buildItem("page", pages.numeric[i]));
      }

      if (this.options.next) {
        var next =
          pages.currentPage < this.options.totalPages
            ? pages.currentPage + 1
            : this.options.loop
            ? 1
            : this.options.totalPages;
        listItems.push(this.buildItem("next", next));
      }

      if (this.options.last) {
        listItems.push(this.buildItem("last", this.options.totalPages));
      }

      return listItems;
    },

    buildItem: function(type, page) {
      var $itemContainer = $("<li></li>"),
        $itemContent = $("<a></a>"),
        itemText = this.options[type]
          ? this.makeText(this.options[type], page)
          : page;

      $itemContainer.addClass(this.options[type + "Class"]);
      $itemContainer.data("page", page);
      $itemContainer.data("page-type", type);
      $itemContainer.append(
        $itemContent
          .attr("href", this.makeHref(page))
          .addClass(this.options.anchorClass)
          .html(itemText)
      );

      return $itemContainer;
    },

    getPages: function(currentPage) {
      var pages = [];

      var half = Math.floor(this.options.visiblePages / 2);
      var start = currentPage - half + 1 - (this.options.visiblePages % 2);
      var end = currentPage + half;

      // handle boundary case
      if (start <= 0) {
        start = 1;
        end = this.options.visiblePages;
      }
      if (end > this.options.totalPages) {
        start = this.options.totalPages - this.options.visiblePages + 1;
        end = this.options.totalPages;
      }

      var itPage = start;
      while (itPage <= end) {
        pages.push(itPage);
        itPage++;
      }

      return { currentPage: currentPage, numeric: pages };
    },

    render: function(pages) {
      var _this = this;
      this.$listContainer.children().remove();
      var items = this.buildListItems(pages);
      jQuery.each(items, function(key, item) {
        _this.$listContainer.append(item);
      });

      this.$listContainer.children().each(function() {
        var $this = $(this),
          pageType = $this.data("page-type");

        switch (pageType) {
          case "page":
            if ($this.data("page") === pages.currentPage) {
              $this.addClass(_this.options.activeClass);
            }
            break;
          case "first":
            $this.toggleClass(
              _this.options.disabledClass,
              pages.currentPage === 1
            );
            break;
          case "last":
            $this.toggleClass(
              _this.options.disabledClass,
              pages.currentPage === _this.options.totalPages
            );
            break;
          case "prev":
            $this.toggleClass(
              _this.options.disabledClass,
              !_this.options.loop && pages.currentPage === 1
            );
            break;
          case "next":
            $this.toggleClass(
              _this.options.disabledClass,
              !_this.options.loop &&
                pages.currentPage === _this.options.totalPages
            );
            break;
          default:
            break;
        }
      });
    },

    setupEvents: function() {
      var _this = this;
      this.$listContainer.off("click").on("click", "li", function(evt) {
        var $this = $(this);
        if (
          $this.hasClass(_this.options.disabledClass) ||
          $this.hasClass(_this.options.activeClass)
        ) {
          return false;
        }
        // Prevent click event if href is not set.
        !_this.options.href && evt.preventDefault();
        _this.show(parseInt($this.data("page")));
      });
    },

    makeHref: function(page) {
      return this.options.href ? this.generateQueryString(page) : "#";
    },

    makeText: function(text, page) {
      return text
        .replace(this.options.pageVariable, page)
        .replace(this.options.totalPagesVariable, this.options.totalPages);
    },
    getPageFromQueryString: function(searchStr) {
      var search = this.getSearchString(searchStr),
        regex = new RegExp(this.options.pageVariable + "(=([^&#]*)|&|#|$)"),
        page = regex.exec(search);
      if (!page || !page[2]) {
        return null;
      }
      page = decodeURIComponent(page[2]);
      page = parseInt(page);
      if (isNaN(page)) {
        return null;
      }
      return page;
    },
    generateQueryString: function(pageNumber, searchStr) {
      var search = this.getSearchString(searchStr),
        regex = new RegExp(this.options.pageVariable + "=*[^&#]*");
      if (!search) return "";
      return (
        "?" +
        search.replace(regex, this.options.pageVariable + "=" + pageNumber)
      );
    },
    getSearchString: function(searchStr) {
      var search = searchStr || window.location.search;
      if (search === "") {
        return null;
      }
      if (search.indexOf("?") === 0) search = search.substr(1);
      return search;
    }
  };

  // PLUGIN DEFINITION

  $.fn.twbsPagination = function(option) {
    var args = Array.prototype.slice.call(arguments, 1);
    var methodReturn;

    var $this = $(this);
    var data = $this.data("twbs-pagination");
    var options = typeof option === "object" ? option : {};

    if (!data)
      $this.data("twbs-pagination", (data = new TwbsPagination(this, options)));
    if (typeof option === "string")
      methodReturn = data[option].apply(data, args);

    return methodReturn === undefined ? $this : methodReturn;
  };

  $.fn.twbsPagination.defaults = {
    totalPages: 1,
    startPage: 1,
    visiblePages: 5,
    initiateStartPageClick: true,
    hideOnlyOnePage: false,
    href: false,
    pageVariable: "{{page}}",
    totalPagesVariable: "{{total_pages}}",
    page: null,
    first: "First",
    prev: "Previous",
    next: "Next",
    last: "Last",
    loop: false,
    onPageClick: null,
    paginationClass: "pagination",
    nextClass: "page-item next",
    prevClass: "page-item prev",
    lastClass: "page-item last",
    firstClass: "page-item first",
    pageClass: "page-item",
    activeClass: "active",
    disabledClass: "disabled",
    anchorClass: "page-link"
  };

  $.fn.twbsPagination.Constructor = TwbsPagination;

  $.fn.twbsPagination.noConflict = function() {
    $.fn.twbsPagination = old;
    return this;
  };

  $.fn.twbsPagination.version = "1.4.1";
})(window.jQuery, window, document);
